    //
//  InvocationOpDemoViewConroller.m
//  ConcurrencyStudy
//
//  Created by longhuihu on 11-6-27.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "InvocationOpDemoViewConroller.h"



@implementation InvocationOpDemoViewConroller

@synthesize operation=_operation;

// The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
	}
    return self;
}


/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
-(void)OperationMethod:(NSMutableArray*)array
{
	[NSThread sleepForTimeInterval:2.0];
	NSOperation *op = [array objectAtIndex:0];
	if ([op isCancelled]) {
		[self showLog:@"operation method cancelled"];
	} else {
		[self showLog:@"operation method executed"];
	}
}

-(void)startOperation
{
	if (self.operation!=nil) {
		[self.operation cancel];
		self.operation = nil;
	}
	
	[self showLog:@"prepare operation"];
	
	NSMutableArray *array = [[[NSMutableArray alloc] initWithCapacity:1] autorelease];
	self.operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(OperationMethod:) object:array];
	[array addObject:self.operation];
	[self.operation addObserver:self forKeyPath:@"isFinished" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isCancelled" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isExecuting" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isFinished" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isReady" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.queue addOperation:self.operation];
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc. that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}


@end
